Good luck with this. My girlfriend (less than a month left of me calling her that!) and I are both techies and DIY'ers and went the invitation-kit way. As we

Good luck with this. My girlfriend (less than a month left of me calling her that!) and I are both techies and DIY'ers and went the invitation-kit way. As we were putting it all together we came to the same conclusion you did: there should be a web app for that! There's a lot of potential there. Building a really good and slick UI to handle different layouts and customization is not easy and would be a fun challenge for a solid JavaScript programmer. Unless of course you go the Flash route. But this thing could demo really really well on an iPad. Definitely the printing part is important. We printed everything ourselves and it was a lot of work and only possible because she knows our printer inside out. Making this easy is primordial, I think. Most people want to see samples of the different colors before they choose. This is also important because it never looks as it does on the screen.